Bandwidth design for speech-seeking microphone arrays

Automatic delay-steering of uniform arrays of microphones, under control of on-site microprocessors, offers attractive possibilities for large-group teleconferencing. But, steering to wave-arrival directions away from the normal reduces the useable bandwidth over which spatial discrimination is achieved. This report, using the line array as the expository vehicle, derives relations that specify the useful bandwidth as a function of the steering direction, and gives design formulae for the number and spacing of the receiving elements.